Merge tag 'media/v7.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-mediagrafted

Pull media updates from Mauro Carvalho Chehab:

 - v4l2-core: added ISP statistics support and per-block validation

 - v4l2-core: Allow unknown HDR10 white point and luminance

 - New camera sensors: Sony IMX678 and IMX471m, Himax HM1092 IR sensor

 - New codec: Milos: VPU v2.0 codec support

 - isp driver: gained support for Dreamchip RPPX1 ISP framework

 - vsp1 driver: gained support for RZ/T2H and RZ/N2H

 - Novalake driver: gained CVS support for new NVL hardware

 - dvb-core: fix feed leak on failed DMX_ADD_PID

 - several driver fixes, cleanups and minor improvements

* tag 'media/v7.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media: (308 commits)
  media: ipu-bridge: check all DMI entries when overriding sensor rotation
  media: v4l2-async: avoid deleting unlinked ASC entry on link error
  media: rzg2l-cru: Align bytesperline to hardware DMA stride requirement
  media: intel/ipu6: fix async notifier cleanup leak on parse error
  media: staging/ipu7: fix async notifier UAF on probe error path
  media: amd: isp4: fix self-deadlock in isp4sd_pwron_and_init() error path
  media: amd: isp4: release partial allocations in isp4if_alloc_fw_gpumem()
  media: rcar-isp: Fix VSPX reference leaks
  media: rcar-isp: Release ISPCORE resources
  media: i2c: imx415: Release runtime PM reference on VBLANK error
  media: i2c: imx415: Return test pattern write errors
  media: renesas: vsp1: Declare index variables in for loop statement
  media: renesas: vsp1: Make reset control optional to support platforms without a reset line
  media: dt-bindings: media: renesas,vsp1: Document RZ/T2H and RZ/N2H SoCs
  media: dt-bindings: media: renesas,fcp: Document RZ/T2H and RZ/N2H SoCs
  media: nxp: imx8-isi: Add additional 32-bit RGB format support
  media: nxp: imx8-isi: Add 16-bit raw Bayer format support
  media: nxp: imx8-isi: Implement per-stream reference counting for multiplexed streams
  media: nxp: imx8-isi: Use BIT_ULL() for 64-bit stream masks
  media: nxp: imx8-isi: Correct color map between V4L2 and ISI
  ...

1 files changed, 168 insertions, 0 deletions

diff --git a/Documentation/crypto/libcrypto.rst b/Documentation/crypto/libcrypto.rst
new file mode 100644
index 000000000..e911e0521
--- /dev/null
+++ b/Documentation/crypto/libcrypto.rst
@@ -0,0 +1,168 @@
+.. SPDX-License-Identifier: GPL-2.0-or-later
+
+==============
+Crypto library
+==============
+
+The Linux kernel's crypto library (``lib/crypto/``) provides kernel-internal
+users of cryptographic algorithms with faster and easier access to those
+algorithms than the traditional kernel crypto API.
+
+Each cryptographic algorithm is supported via a set of dedicated functions.
+"Crypto agility", where needed, is left to calling code.
+
+The crypto library functions are intended to be boring and straightforward, and
+to follow familiar conventions.  Their primary documentation is their (fairly
+extensive) kernel-doc.  This page just provides some extra high-level context.
+
+Note that the crypto library isn't entirely new.  ``lib/`` has contained some
+crypto functions since 2005.  Rather, it's just an approach that's been expanded
+over time as it's been found to work well.  It also largely just matches how the
+kernel already does things elsewhere.
+
+Scope and intended audience
+===========================
+
+The crypto library documentation is primarily meant for kernel developers who
+need to use a particular cryptographic algorithm(s) in kernel code.  For
+example, "I just need to compute a SHA-256 hash."  A secondary audience is
+developers working on the crypto algorithm implementations themselves.
+
+If you're looking for more general information about cryptography, like the
+differences between the different crypto algorithms or how to select an
+appropriate algorithm, you should refer to external sources which cover that
+type of information much more comprehensively.  If you need help selecting
+algorithms for a new kernel feature that doesn't already have its algorithms
+predefined, please reach out to ``linux-crypto@vger.kernel.org`` for advice.
+
+Code organization
+=================
+
+- ``lib/crypto/*.c``: the crypto algorithm implementations
+
+- ``lib/crypto/$(SRCARCH)/``: architecture-specific code for crypto algorithms.
+  It is here rather than somewhere in ``arch/`` partly because this allows
+  generic and architecture-optimized code to be easily built into a single
+  loadable module (when the algorithm is set to 'm' in the kconfig).
+
+- ``lib/crypto/tests/``: KUnit tests for the crypto algorithms
+
+- ``include/crypto/``: crypto headers, for both the crypto library and the
+  traditional crypto API
+
+Generally, there is one kernel module per algorithm.  Sometimes related
+algorithms are grouped into one module.  There is intentionally no common
+framework, though there are some utility functions that multiple algorithms use.
+
+Each algorithm module is controlled by a tristate kconfig symbol
+``CRYPTO_LIB_$(ALGORITHM)``.  As is the norm for library functions in the
+kernel, these are hidden symbols which don't show up in the kconfig menu.
+Instead, they are just selected by all the kconfig symbols that need them.
+
+Many of the algorithms have multiple implementations: a generic implementation
+and architecture-optimized implementation(s).  Each module initialization
+function, or initcall in the built-in case, automatically enables the best
+implementation based on the available CPU features.
+
+Note that the crypto library doesn't use the ``crypto/``,
+``arch/$(SRCARCH)/crypto/``, or ``drivers/crypto/`` directories.  These
+directories are used by the traditional crypto API.  When possible, algorithms
+in the traditional crypto API are implemented by calls into the library.
+
+Advantages
+==========
+
+Some of the advantages of the library over the traditional crypto API are:
+
+- The library functions tend to be much easier to use.  For example, a hash
+  value can be computed using only a single function call.  Most of the library
+  functions always succeed and return void, eliminating the need to write
+  error-handling code.  Most also accept standard virtual addresses, rather than
+  scatterlists which are difficult and less efficient to work with.
+
+- The library functions are usually faster, especially for short inputs.  They
+  call the crypto algorithms directly without inefficient indirect calls, memory
+  allocations, string parsing, lookups in an algorithm registry, and other
+  unnecessary API overhead.  Architecture-optimized code is enabled by default.
+
+- The library functions use standard link-time dependencies instead of
+  error-prone dynamic loading by name.  There's no need for workarounds such as
+  forcing algorithms to be built-in or adding module soft dependencies.
+
+- The library focuses on the approach that works the best on the vast majority
+  of systems: CPU-based implementations of the crypto algorithms, utilizing
+  on-CPU acceleration (such as AES instructions) when available.
+
+- The library uses standard KUnit tests, rather than custom ad-hoc tests.
+
+- The library tends to have higher assurance implementations of the crypto
+  algorithms.  This is both due to its simpler design and because more of its
+  code is being regularly tested.
+
+- The library supports features that don't fit into the rigid framework of the
+  traditional crypto API, for example interleaved hashing and XOFs.
+
+When to use it
+==============
+
+In-kernel users should use the library (rather than the traditional crypto API)
+whenever possible.  Many subsystems have already been converted.  It usually
+simplifies their code significantly and improves performance.
+
+Some kernel features allow userspace to provide an arbitrary string that selects
+an arbitrary algorithm from the traditional crypto API by name.  These features
+generally will have to keep using the traditional crypto API for backwards
+compatibility.
+
+Note: new kernel features shouldn't support every algorithm, but rather make a
+deliberate choice about what algorithm(s) to support.  History has shown that
+making a deliberate, thoughtful choice greatly simplifies code maintenance,
+reduces the chance for mistakes (such as using an obsolete, insecure, or
+inappropriate algorithm), and makes your feature easier to use.
+
+Testing
+=======
+
+The crypto library uses standard KUnit tests.  Like many of the kernel's other
+KUnit tests, they are included in the set of tests that is run by
+``tools/testing/kunit/kunit.py run --alltests``.
+
+A ``.kunitconfig`` file is also provided to run just the crypto library tests.
+For example, here's how to run them in user-mode Linux:
+
+.. code-block:: sh
+
+    tools/testing/kunit/kunit.py run --kunitconfig=lib/crypto/
+
+Many of the crypto algorithms have architecture-optimized implementations.
+Testing those requires building an appropriate kernel and running the tests
+either in QEMU or on appropriate hardware.  Here's one example with QEMU:
+
+.. code-block:: sh
+
+    tools/testing/kunit/kunit.py run --kunitconfig=lib/crypto/ --arch=arm64 --make_options LLVM=1
+
+Depending on the code being tested, flags may need to be passed to QEMU to
+emulate the correct type of hardware for the code to be reached.
+
+Since correctness is essential in cryptographic code, new architecture-optimized
+code is accepted only if it can be tested in QEMU.
+
+Note: the crypto library also includes FIPS 140 self-tests.  These are
+lightweight, are designed specifically to meet FIPS 140 requirements, and exist
+*only* to meet those requirements.  Normal testing done by kernel developers and
+integrators should use the much more comprehensive KUnit tests instead.
+
+API documentation
+=================
+
+.. toctree::
+   :maxdepth: 2
+
+   libcrypto-auth-encryption
+   libcrypto-blockcipher
+   libcrypto-hash
+   libcrypto-signature
+   libcrypto-unauth-encryption
+   libcrypto-utils
+   sha3